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cache the value of file_inode() in struct file

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Note that this thing does *not* contribute to inode refcount;
it's pinned down by dentry.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-07-01 23:47:19 +03:00 committed by Francescodario Cuzzocrea
parent 3c14ba2074
commit 70fd6c8517
5 changed files with 13 additions and 12 deletions
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3
fs/f2fs/f2fs.h
View file

@ -1844,10 +1844,11 @@ static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi)
return is_set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
}
/* Implementation of file_inode added to include/linux/fs.h
static inline struct inode *file_inode(struct file *f)
{
return f->f_path.dentry->d_inode;
}
}*/
static inline bool is_dot_dotdot(const struct qstr *str)
{

2
fs/file_table.c
View file

@ -172,6 +172,7 @@ struct file *alloc_file(struct path *path, fmode_t mode,
return NULL;
file->f_path = *path;
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_mode = mode;
file->f_op = fop;
@ -254,6 +255,7 @@ static void __fput(struct file *file)
drop_file_write_access(file);
file->f_path.dentry = NULL;
file->f_path.mnt = NULL;
file->f_inode = NULL;
file_free(file);
dput(dentry);
mntput(mnt);

2
fs/open.c
View file

@ -673,6 +673,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_mode = FMODE_PATH;
inode = dentry->d_inode;
f->f_inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, mnt);
if (error)
@ -748,6 +749,7 @@ cleanup_all:
}
f->f_path.dentry = NULL;
f->f_path.mnt = NULL;
f->f_inode = NULL;
cleanup_file:
put_filp(f);
dput(dentry);

11
fs/sdfat/sdfat.c
View file

@ -574,17 +574,6 @@ out_unlocked:
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
/* EMPTY */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0) */
static inline struct inode *file_inode(const struct file *f)
{
return f->f_dentry->d_inode;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0)
static inline int __is_sb_dirty(struct super_block *sb)
{

7
include/linux/fs.h
View file

@ -1029,6 +1029,7 @@ struct file {
struct path f_path;
#define f_dentry f_path.dentry
#define f_vfsmnt f_path.mnt
struct inode *f_inode; /* cached value */
const struct file_operations *f_op;
/*
@ -2304,6 +2305,12 @@ static inline bool execute_ok(struct inode *inode)
return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}
static inline struct inode *file_inode(struct file *f)
{
/* return f->f_path.dentry->d_inode; / can also use this */
return f->f_inode;
}
/*
* get_write_access() gets write permission for a file.
* put_write_access() releases this write permission.